National Security Inc.

In June, a stone carver from Manassas chiseled another perfect star into a marble wall at CIA headquarters, one of 22 for agency workers killed in the global war initiated by the 2001 terrorist attacks.

The intent of the memorial is to publicly honor the courage of those who died in the line of duty, but it also conceals a deeper story about government in the post-9/11 era: Eight of the 22 were not CIA officers at all. They were private contractors.

To ensure that the country’s most sensitive duties are carried out only by people loyal above all to the nation’s interest, federal rules say contractors may not perform what are called “inherently government functions.” But they do, all the time and in every intelligence and counterterrorism agency, according to a two-year investigation by The Washington Post.

What started as a temporary fix in response to the terrorist attacks has turned into a dependency that calls into question whether the federal workforce includes too many people obligated to shareholders rather than the public interest — and whether the government is still in control of its most sensitive activities. In interviews last week, both Defense Secretary Robert M. Gates and CIA Director Leon Panetta said they agreed with such concerns.

The Post investigation uncovered what amounts to an alternative geography of the United States, a Top Secret America created since 9/11 that is hidden from public view, lacking in thorough oversight and so unwieldy that its effectiveness is impossible to determine.

It is also a system in which contractors are playing an ever more important role. The Post estimates that out of 854,000 people with top-secret clearances, 265,000 are contractors. There is no better example of the government’s dependency on them than at the CIA, the one place in government that exists to do things overseas that no other U.S. agency is allowed to do.

Private contractors working for the CIA have recruited spies in Iraq, paid bribes for information in Afghanistan and protected CIA directors visiting world capitals. Contractors have helped snatch a suspected extremist off the streets of Italy, interrogated detainees once held at secret prisons abroad and watched over defectors holed up in the Washington suburbs. At Langley headquarters, they analyze terrorist networks. At the agency’s training facility in Virginia, they are helping mold a new generation of American spies.